Just as a heads-up. Ubuntu 17.04 is scheduled for release today. I just checked and the images are online. E.g.: Index of /releases/17.04
Many times a new Ubuntu release means mirrors get overloaded.
If you are using AMD Ryzen desktop systems, this is where I would start.
Many times a new Ubuntu release means mirrors get overloaded.
If you are using AMD Ryzen desktop systems, this is where I would start.